Growing cannabis has so many strategies and techniques that it can feel like diving into a new world. One method that’s gaining popularity is the Gas Lantern Routine (GLR). If you’re curious about how this lighting schedule works and why it might be a game-changer for your grow, you’re in the right place. Let’s break it down together so it’s easy to follow and, more importantly, easy to implement.
Understanding the Gas Lantern Routine (GLR)
The Gas Lantern Routine (GLR) is a unique lighting schedule for growing cannabis that aims to mimic natural light patterns. Unlike traditional methods, GLR incorporates a shorter vegetative light cycle with a brief burst of light during what would usually be a dark period.
Origins and historical context of GLR
GLR isn’t new; it’s been around for a while, especially among old-school gardeners. Originally, it was used to conserve energy while keeping plants in their vegetative state. This method was inspired by how plants naturally respond to moonlight interruptions in the wild.
Definition and core principles of the Gas lantern Routine
At its core, GLR is about balance. It involves 12 hours of light, 5.5 hours of darkness, 1 hour of light (the ‘gas lantern’ period), and another 5.5 hours of darkness. This routine keeps plants awake just enough to prevent flowering while saving energy compared to the traditional 18/6 or 24/0 light cycles.
Comparison with traditional lighting schedules in cannabis cultivation
While traditional schedules like 18/6 or 24/0 blast plants with extended light, GLR gives them a break. This intermittent lighting can save energy and money, while some growers claim it promotes healthier growth and prepares plants for flowering more naturally.
Implementing the Gas Lantern Routine in cannabis growth

If you’re ready to give GLR a try, it’s easier than you might think. With a little planning and some basic tools, you can set up this schedule and see the benefits firsthand.
Step-by-step guide to applying GLR in indoor cultivation
- Set your timer to provide 12 hours of light for your plants.
- After the first dark cycle of 5.5 hours, program the lights to turn on for 1 hour.
- Follow this with another 5.5 hours of darkness.
- Stick to this routine consistently throughout the vegetative phase.
Necessary equipment and tools for GLR implementation
You’ll need:
- A reliable timer to automate your light cycles.
- Grow lights suitable for your cannabis plants.
- A well-ventilated grow space to maintain optimal temperature and humidity.
Monitoring plant responses and adjusting light cycles
Keep an eye on your plants. If they show signs of stress—like drooping leaves or stunted growth—adjust your routine slightly. Every strain responds differently, so tweak as needed.
Benefits of using the Gas Lantern Routine

Energy efficiency and cost savings
GLR reduces overall light usage, cutting down your electricity bill. Less light doesn’t mean less growth; it’s about smarter use of lighting.
Promoting natural growth patterns in cannabis plants
By mimicking natural light interruptions, GLR helps your plants grow more like they would in the wild. This can result in healthier, sturdier plants.
Potential for enhanced yields and plant health
Some growers report better yields and more resilient plants with GLR. While this isn’t guaranteed, the method’s ability to save energy while supporting growth makes it worth trying.
Potential drawbacks and considerations
As with any method, GLR has its downsides. Knowing what to watch out for will help you navigate these challenges.
Strain sensitivity and adaptability to GLR
Not all cannabis strains thrive under GLR. Some, especially autoflowers, might not respond well. Research your strain’s preferences before diving in.
Risks of plant stress and hermaphroditism
Light interruptions can sometimes stress plants, leading to hermaphroditism. Keep your lighting consistent to minimize this risk.
Increased monitoring and maintenance requirements
GLR requires more attention than traditional schedules. You’ll need to monitor your plants closely and be ready to adjust if needed.
Transitioning from GLR to flowering stage
When it’s time to flower, you’ll need to tweak your lighting schedule to encourage bud development.
Adjusting light schedules for optimal flowering
Switch to a 12/12 light schedule to trigger flowering. Ensure complete darkness during the dark phase to avoid stressing your plants.
Signs indicating readiness for flowering phase
Look for pre-flowering signs like pistils or changes in leaf structure. These indicate your plants are ready to make the switch.
Frequently Asked Questions:
What is the Gas Lantern Routine in cannabis cultivation?
The Gas Lantern Routine is a lighting method using a unique schedule of light and dark periods to optimize plant growth while saving energy. It involves shorter vegetative light cycles and a brief ‘gas lantern’ light period during the dark phase.
How does GLR differ from traditional 18/6 or 24/0 light cycles?
GLR mimics natural light interruptions with shorter light cycles and less energy use. Traditional methods rely on long, continuous light periods, while GLR offers a more energy-efficient alternative.
Can all cannabis strains thrive under the Gas Lantern Routine?
Not all strains adapt well to GLR. Photoperiod strains typically respond better than autoflowers, which may not benefit from this method.
What are the main benefits of implementing GLR?
GLR reduces energy consumption, promotes natural growth patterns, and may enhance yields. It’s a cost-effective method that aligns more closely with how plants grow in nature.